Results 131 to 140 of about 10,083 (253)

Time‐Varying Dispersion Integer‐Valued GARCH Models

Journal of Time Series Analysis, Volume 47, Issue 4, Page 839-853, July 2026.
ABSTRACT We introduce a general class of INteger‐valued Generalized AutoRegressive Conditionally Heteroscedastic (INGARCH) processes by allowing simultaneously time‐varying mean and dispersion parameters. We call such models time‐varying dispersion INGARCH (tv‐DINGARCH) models.
Wagner Barreto‐Souza, Luiza S. C. Piancastelli, Konstantinos Fokianos, Hernando Ombao   +3 more
wiley   +1 more source

A Path to Improving Simulated Properties of Low Clouds Over the Beaufort Sea Using Airborne in Situ Observations of Subgrid‐Scale Variability

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 11, 16 June 2026.
Abstract Arctic low clouds influence Arctic system evolution through their effects on the atmosphere and surface. Unfortunately, atmospheric models and retrospective analysis (reanalysis) struggle to simulate Arctic low cloud occurrence and properties.
J. B. Dodson, P. C. Taylor, D. O. Barahona   +2 more
wiley   +1 more source

The Multiscale Non‐Gaussian Statistics of Free‐Running 1000‐Member General Circulation Model Ensembles

Atmospheric Science Letters, Volume 27, Issue 6, June 2026.
This study investigates the multiscale evolution of forecast distributions using 1000‐member global circulation model ensembles. Initially different distributions converge to the same time‐varying equilibrium distribution, and the equilibration time scale noticeably exceeds the variance saturation time. Prior to equilibration, the forecast distribution
Man‐Yau Chan, Hristo G. Chipilski, Jack Schwartz, Max Albrecht, Aiden Ridgway, Saurav Dey Shuvo   +5 more
wiley   +1 more source

Central Limit Theorem for Random “Contractive” Functions on Interval

Annales Mathematicae Silesianae
We use the approach from Czudek and Szarek (see [1]) to prove the central limit theorem for a stationary Markov chain generated by an iterative function system for a family of increasing, injective functions on [0, 1] with “contractive” properties.
Block Maciej, Kacprzak Wiktoria, Falęcki Dorian   +2 more
doaj   +1 more source

Classical and quantum ergodicity

, 2017
This chapter proves results involving the quantum ergodicity of certain high-frequency eigenfunctions. Ergodic theory originally arose in the work of physicists studying statistical mechanics at the end of the nineteenth century.
Christopher D. Sogge
core   +1 more source

Frequency Standard Contributions to Limitations on the Signal‐to‐Noise Ratio in Very Long Baseline Interferometric Observations

Radio Science, Volume 61, Issue 6, June 2026.
Abstract Since its observation in 2019, the first image of a super‐massive black hole using Very Long Baseline Interferometry (VLBI) with an Earth‐scale baseline has generated much scientific and public interest. Work is now underway to extend the baseline into space to obtain higher image resolution.
E. A. Burt, T. A. Ely, G. C. Bower, T. J. W. Lazio, M. Anderson, S. Hernandez   +5 more
wiley   +1 more source

Robust Calibration of Hydrological Models for Simulating Unseen Flood Extremes

Water Resources Research, Volume 62, Issue 6, June 2026.
Abstract Calibrating conceptual rainfall‐runoff models to predict a catchment's response to extreme rainfall events is a significant challenge, especially when historical data is limited and the event exceeds recorded extremes. This challenge is amplified in non‐stationary environments where the frequency and intensity of extreme rainfall and floods ...
Caleb Dykman, Conrad Wasko, Rory Nathan, Ashish Sharma   +3 more
wiley   +1 more source

Coherent Forecasting of Ordinal Time Series With Application to Air‐Quality Data

Australian &New Zealand Journal of Statistics, Volume 68, Issue 2, June 2026.
ABSTRACT Motivated by an application to air quality data, we provide a comprehensive investigation of coherent forecasting techniques for ordinal time series. Here, the coherency requirement expresses that the computed forecast values have to be consistent with the ordered qualitative range of the data‐generating process (DGP).
Christian H. Weiß, Osama Swidan, Layth C. Alwan   +2 more
wiley   +1 more source

Strong Ergodicity in Nonhomogeneous Markov Systems with Chronological Order

Mathematics
In the present, we study the problem of strong ergodicity in nonhomogeneous Markov systems. In the first basic theorem, we relax the fundamental assumption present in all studies of asymptotic behavior.
P.-C.G. Vassiliou
doaj   +1 more source

Joint ergodicity along generalized linear functions

, 2018
A criterion of joint ergodicity of several sequences of transformations of a probability measure space X of the form T-i(phi i(n)) is given for the case where T-i are commuting measure-preserving transformations of X and phi(i) are integer-valued ...
Leibman, A, Son, Y, Bergelson, V
core   +1 more source